If a 30 m ladder is placed against a 15 m wall such that it just reaches the top of the wall, then the elevation of the wall is equal to?
A. 45° B. 30° C. 60° D. 50° Answer: Option BShow Answer
Solution(By Apex Team)
$\begin{array}{l}
\mathrm{AC}=30 \text { meter } \\
\mathrm{AB}=15 \text { meter } \\
\angle \mathrm{ACB}=\theta \\
\therefore \sin \theta=\frac{A B}{A C}=\frac{15}{30}=\frac{1}{2} \\
\Rightarrow \sin \theta=\sin 30^{\circ} \\
\Rightarrow \theta=30^{\circ}
\end{array}$
